The Tcpdump Group git mirrors - tcpdump/blob - parsenfsfh.c

   1 /*
   2  * parsenfsfh.c - portable parser for NFS file handles
   3  *                      uses all sorts of heuristics
   4  *
   5  * Jeffrey C. Mogul
   6  * Digital Equipment Corporation
   7  * Western Research Laboratory
   8  */
   9
  10 #ifndef lint
  11 static const char rcsid[] =
  12     "@(#) $Header: /tcpdump/master/tcpdump/parsenfsfh.c,v 1.16 1999-11-21 09:36:47 fenner Exp $ (LBL)";
  13 #endif
  14
  15 #ifdef HAVE_CONFIG_H
  16 #include "config.h"
  17 #endif
  18
  19 #include <sys/types.h>
  20 #include <sys/time.h>
  21
  22 #include <ctype.h>
  23 #ifdef HAVE_MEMORY_H
  24 #include <memory.h>
  25 #endif
  26 #include <stdio.h>
  27 #include <string.h>
  28
  29 #include "interface.h"
  30 #include "nfsfh.h"
  31
  32 /*
  33  * This routine attempts to parse a file handle (in network byte order),
  34  * using heuristics to guess what kind of format it is in.  See the
  35  * file "fhandle_layouts" for a detailed description of the various
  36  * patterns we know about.
  37  *
  38  * The file handle is parsed into our internal representation of a
  39  * file-system id, and an internal representation of an inode-number.
  40  */
  41
  42 #define FHT_UNKNOWN     0
  43 #define FHT_AUSPEX      1
  44 #define FHT_DECOSF      2
  45 #define FHT_IRIX4       3
  46 #define FHT_IRIX5       4
  47 #define FHT_SUNOS3      5
  48 #define FHT_SUNOS4      6
  49 #define FHT_ULTRIX      7
  50 #define FHT_VMSUCX      8
  51 #define FHT_SUNOS5      9
  52 #define FHT_AIX32       10
  53 #define FHT_HPUX9       11
  54
  55 #ifdef  ultrix
  56 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
  57 #define XFF(x)  ((u_int32_t)(x))
  58 #else
  59 #define XFF(x)  (x)
  60 #endif
  61
  62 #define make_uint32(msb,b,c,lsb)\
  63         (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
  64
  65 #define make_uint24(msb,b, lsb)\
  66         (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
  67
  68 #define make_uint16(msb,lsb)\
  69         (XFF(lsb) + (XFF(msb)<<8))
  70
  71 #ifdef  __alpha
  72         /* or other 64-bit systems */
  73 #define make_uint48(msb,b,c,d,e,lsb)\
  74         ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40))
  75 #else
  76         /* on 32-bit systems ignore high-order bits */
  77 #define make_uint48(msb,b,c,d,e,lsb)\
  78         ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24))
  79 #endif
  80
  81 static int is_UCX(unsigned char *);
  82
  83 void
  84 Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself)
  85 register caddr_t *fh;
  86 int len;
  87 my_fsid *fsidp;
  88 ino_t *inop;
  89 char **osnamep;         /* if non-NULL, return OS name here */
  90 char **fsnamep;         /* if non-NULL, return server fs name here (for VMS) */
  91 int ourself;            /* true if file handle was generated on this host */
  92 {
  93         register unsigned char *fhp = (unsigned char *)fh;
  94         u_int32_t temp;
  95         int fhtype = FHT_UNKNOWN;
  96
  97         if (ourself) {
  98             /* File handle generated on this host, no need for guessing */
  99 #if     defined(IRIX40)
 100             fhtype = FHT_IRIX4;
 101 #endif
 102 #if     defined(IRIX50)
 103             fhtype = FHT_IRIX5;
 104 #endif
 105 #if     defined(IRIX51)
 106             fhtype = FHT_IRIX5;
 107 #endif
 108 #if     defined(SUNOS4)
 109             fhtype = FHT_SUNOS4;
 110 #endif
 111 #if     defined(SUNOS5)
 112             fhtype = FHT_SUNOS5;
 113 #endif
 114 #if     defined(ultrix)
 115             fhtype = FHT_ULTRIX;
 116 #endif
 117 #if     defined(__osf__)
 118             fhtype = FHT_DECOSF;
 119 #endif
 120         }
 121         /*
 122          * This is basically a big decision tree
 123          */
 124         else if ((fhp[0] == 0) && (fhp[1] == 0)) {
 125             /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
 126             /* probably rules out HP-UX, AIX unless they allow major=0 */
 127             if ((fhp[2] == 0) && (fhp[3] == 0)) {
 128                 /* bytes[2,3] == (0,0); must be Auspex */
 129                 /* XXX or could be Ultrix+MASSBUS "hp" disk? */
 130                 fhtype = FHT_AUSPEX;
 131             }
 132             else {
 133                 /*
 134                  * bytes[2,3] != (0,0); rules out Auspex, could be
 135                  * DECOSF, SUNOS4, or IRIX4
 136                  */
 137                 if ((fhp[4] != 0) && (fhp[5] == 0) &&
 138                         (fhp[8] == 12) && (fhp[9] == 0)) {
 139                     /* seems to be DECOSF, with minor == 0 */
 140                     fhtype = FHT_DECOSF;
 141                 }
 142                 else {
 143                     /* could be SUNOS4 or IRIX4 */
 144                     /* XXX the test of fhp[5] == 8 could be wrong */
 145                     if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) &&
 146                         (fhp[7] == 0)) {
 147                         /* looks like a length, not a file system typecode */
 148                         fhtype = FHT_IRIX4;
 149                     }
 150                     else {
 151                         /* by elimination */
 152                         fhtype = FHT_SUNOS4;
 153                     }
 154                 }
 155             }
 156         }
 157         else {
 158             /*
 159              * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
 160              * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
 161              * could be AIX, HP-UX
 162              */
 163             if ((fhp[2] == 0) && (fhp[3] == 0)) {
 164                 /*
 165                  * bytes[2,3] == (0,0); rules out OSF, probably not UCX
 166                  * (unless the exported device name is just one letter!),
 167                  * could be Ultrix, IRIX5, AIX, or SUNOS5
 168                  * might be HP-UX (depends on their values for minor devs)
 169                  */
 170                 /*XXX we probably only need to test of these two bytes */
 171                 if ((fhp[21] == 0) && (fhp[23] == 0)) {
 172                     fhtype = FHT_ULTRIX;
 173                 }
 174                 else {
 175                     /* Could be SUNOS5/IRIX5, maybe AIX */
 176                     /* XXX no obvious difference between SUNOS5 and IRIX5 */
 177                     if (fhp[9] == 10)
 178                         fhtype = FHT_SUNOS5;
 179                     /* XXX what about AIX? */
 180                 }
 181             }
 182             else {
 183                 /*
 184                  * bytes[2,3] != (0,0); rules out Ultrix, could be
 185                  * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
 186                  */
 187                 if ((fhp[8] == 12) && (fhp[9] == 0)) {
 188                     fhtype = FHT_DECOSF;
 189                 }
 190                 else if ((fhp[8] == 0) && (fhp[9] == 10)) {
 191                     /* could be SUNOS5/IRIX5, AIX, HP-UX */
 192                     if ((fhp[7] == 0) && (fhp[6] == 0) &&
 193                         (fhp[5] == 0) && (fhp[4] == 0)) {
 194                         /* XXX is this always true of HP-UX? */
 195                         fhtype = FHT_HPUX9;
 196                     }
 197                     else if (fhp[7] == 2) {
 198                         /* This would be MNT_NFS on AIX, which is impossible */
 199                         fhtype = FHT_SUNOS5;    /* or maybe IRIX5 */
 200                     }
 201                     else {
 202                         /*
 203                          * XXX Could be SUNOS5/IRIX5 or AIX.  I don't
 204                          * XXX see any way to disambiguate these, so
 205                          * XXX I'm going with the more likely guess.
 206                          * XXX Sorry, Big Blue.
 207                          */
 208                         fhtype = FHT_SUNOS5;    /* or maybe IRIX5 */
 209                     }
 210                 }
 211                 else {
 212                     if (is_UCX(fhp)) {
 213                         fhtype = FHT_VMSUCX;
 214                     }
 215                     else {
 216                         fhtype = FHT_UNKNOWN;
 217                     }
 218                 }
 219             }
 220         }
 221
 222         /* XXX still needs to handle SUNOS3 */
 223
 224         switch (fhtype) {
 225         case FHT_AUSPEX:
 226             fsidp->Fsid_dev.Minor = fhp[7];
 227             fsidp->Fsid_dev.Major = fhp[6];
 228             fsidp->fsid_code = 0;
 229
 230             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 231             *inop = temp;
 232
 233             if (osnamep)
 234                 *osnamep = "Auspex";
 235             break;
 236
 237         case FHT_DECOSF:
 238             fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 239                         /* XXX could ignore 3 high-order bytes */
 240
 241             temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
 242             fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
 243             fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
 244
 245             temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
 246             *inop = temp;
 247             if (osnamep)
 248                 *osnamep = "OSF";
 249             break;
 250
 251         case FHT_IRIX4:
 252             fsidp->Fsid_dev.Minor = fhp[3];
 253             fsidp->Fsid_dev.Major = fhp[2];
 254             fsidp->fsid_code = 0;
 255
 256             temp = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
 257             *inop = temp;
 258
 259             if (osnamep)
 260                 *osnamep = "IRIX4";
 261             break;
 262
 263         case FHT_IRIX5:
 264             fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
 265             fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
 266             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 267
 268             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 269             *inop = temp;
 270
 271             if (osnamep)
 272                 *osnamep = "IRIX5";
 273             break;
 274
 275         case FHT_SUNOS3:
 276             if (osnamep)
 277                 *osnamep = "SUNOS3";
 278             break;
 279
 280         case FHT_SUNOS4:
 281             fsidp->Fsid_dev.Minor = fhp[3];
 282             fsidp->Fsid_dev.Major = fhp[2];
 283             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 284
 285             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 286             *inop = temp;
 287
 288             if (osnamep)
 289                 *osnamep = "SUNOS4";
 290             break;
 291
 292         case FHT_SUNOS5:
 293             temp = make_uint16(fhp[0], fhp[1]);
 294             fsidp->Fsid_dev.Major = (temp>>2) &  0x3FFF;
 295             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 296             fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
 297             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 298
 299             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 300             *inop = temp;
 301
 302             if (osnamep)
 303                 *osnamep = "SUNOS5";
 304             break;
 305
 306         case FHT_ULTRIX:
 307             fsidp->fsid_code = 0;
 308             fsidp->Fsid_dev.Minor = fhp[0];
 309             fsidp->Fsid_dev.Major = fhp[1];
 310
 311             temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 312             *inop = temp;
 313             if (osnamep)
 314                 *osnamep = "Ultrix";
 315             break;
 316
 317         case FHT_VMSUCX:
 318             /* No numeric file system ID, so hash on the device-name */
 319             if (sizeof(*fsidp) >= 14) {
 320                 if (sizeof(*fsidp) > 14)
 321                     memset((char *)fsidp, 0, sizeof(*fsidp));
 322                 /* just use the whole thing */
 323                 memcpy((char *)fsidp, (char *)fh, 14);
 324             }
 325             else {
 326                 u_int32_t tempa[4];     /* at least 16 bytes, maybe more */
 327
 328                 memset((char *)tempa, 0, sizeof(tempa));
 329                 memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */
 330                 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
 331                 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
 332                 fsidp->fsid_code = 0;
 333             }
 334
 335             /* VMS file ID is: (RVN, FidHi, FidLo) */
 336             *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
 337
 338             /* Caller must save (and null-terminate?) this value */
 339             if (fsnamep)
 340                 *fsnamep = (char *)&(fhp[1]);
 341
 342             if (osnamep)
 343                 *osnamep = "VMS";
 344             break;
 345
 346         case FHT_AIX32:
 347             fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
 348             fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
 349             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 350
 351             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 352             *inop = temp;
 353
 354             if (osnamep)
 355                 *osnamep = "AIX32";
 356             break;
 357
 358         case FHT_HPUX9:
 359             fsidp->Fsid_dev.Major = fhp[0];
 360             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 361             fsidp->Fsid_dev.Minor = temp;
 362             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 363
 364             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 365             *inop = temp;
 366
 367             if (osnamep)
 368                 *osnamep = "HPUX9";
 369             break;
 370
 371         case FHT_UNKNOWN:
 372 #ifdef DEBUG
 373             {
 374                 /* XXX debugging */
 375                 int i;
 376                 for (i = 0; i < 32; i++)
 377                         (void)fprintf(stderr, "%x.", fhp[i]);
 378                 (void)fprintf(stderr, "\n");
 379             }
 380 #endif
 381             /* XXX for now, give "bogus" values to aid debugging */
 382             fsidp->fsid_code = 0;
 383             fsidp->Fsid_dev.Minor = 257;
 384             fsidp->Fsid_dev.Major = 257;
 385             *inop = 1;
 386
 387             /* display will show this string instead of (257,257) */
 388             if (fsnamep)
 389                 *fsnamep = "Unknown";
 390
 391             if (osnamep)
 392                 *osnamep = "Unknown";
 393             break;
 394
 395         }
 396 }
 397
 398 /*
 399  * Is this a VMS UCX file handle?
 400  *      Check for:
 401  *      (1) leading code byte   [XXX not yet]
 402  *      (2) followed by string of printing chars & spaces
 403  *      (3) followed by string of nulls
 404  */
 405 static int
 406 is_UCX(fhp)
 407 unsigned char *fhp;
 408 {
 409         register int i;
 410         int seen_null = 0;
 411
 412         for (i = 1; i < 14; i++) {
 413             if (isprint(fhp[i])) {
 414                 if (seen_null)
 415                    return(0);
 416                 else
 417                    continue;
 418             }
 419             else if (fhp[i] == 0) {
 420                 seen_null = 1;
 421                 continue;
 422             }
 423             else
 424                 return(0);
 425         }
 426
 427         return(1);
 428 }